<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
    </head>
  <style>
.notice{
  width: 300px;
  height: 40px;
  color:white;
  margin:0 auto;
  padding-top: 10px;
  text-align: center;
  border-radius:5px;
  margin-top:200px;
  background-color: pink;
}
  </style>
    <body>
  <div class="notice">
     升级中...
  </div>
    </body>
</html>